jdk8-mips64-public/hotspot: src/share/vm/oops/symbol.cpp@bd7a7ce2e264 (annotated)

src/share/vm/oops/symbol.cpp@bd7a7ce2e264 (annotated)

src/share/vm/oops/symbol.cpp

Mon, 12 Nov 2012 14:03:53 -0800

author: minqi
date: Mon, 12 Nov 2012 14:03:53 -0800
changeset 4267: bd7a7ce2e264
parent 4037: da91efe96a93
child 4531: fcc9e7681d63
permissions: -rw-r--r--

6830717: replay of compilations would help with debugging
Summary: When java process crashed in compiler thread, repeat the compilation process will help finding root cause. This is done with using SA dump application class data and replay data from core dump, then use debug version of jvm to recompile the problematic java method.
Reviewed-by: kvn, twisti, sspitsyn
Contributed-by: yumin.qi@oracle.com

 /*
  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/altHashing.hpp"
 #include "classfile/classLoaderData.hpp"
 #include "oops/symbol.hpp"
 #include "runtime/os.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/resourceArea.hpp"
 Symbol::Symbol(const u1* name, int length, int refcount) : _refcount(refcount), _length(length) {
   _identity_hash = os::random();
   for (int i = 0; i < _length; i++) {
     byte_at_put(i, name[i]);
   }
 }
 void* Symbol::operator new(size_t sz, int len, TRAPS) {
   int alloc_size = size(len)*HeapWordSize;
   address res = (address) AllocateHeap(alloc_size, mtSymbol);
   return res;
 }
 void* Symbol::operator new(size_t sz, int len, Arena* arena, TRAPS) {
   int alloc_size = size(len)*HeapWordSize;
   address res = (address)arena->Amalloc(alloc_size);
   return res;
 }
 void* Symbol::operator new(size_t sz, int len, ClassLoaderData* loader_data, TRAPS) {
   address res;
   int alloc_size = size(len)*HeapWordSize;
   res = (address) Metaspace::allocate(loader_data, size(len), true,
                                       Metaspace::NonClassType, CHECK_NULL);
   return res;
 }
 void Symbol::operator delete(void *p) {
   assert(((Symbol*)p)->refcount() == 0, "should not call this");
   FreeHeap(p);
 }
 // ------------------------------------------------------------------
 // Symbol::equals
 //
 // Compares the symbol with a string of the given length.
 bool Symbol::equals(const char* str, int len) const {
   int l = utf8_length();
   if (l != len) return false;
   while (l-- > 0) {
     if (str[l] != (char) byte_at(l))
       return false;
   }
   assert(l == -1, "we should be at the beginning");
   return true;
 }
 // ------------------------------------------------------------------
 // Symbol::starts_with
 //
 // Tests if the symbol starts with the specified prefix of the given
 // length.
 bool Symbol::starts_with(const char* prefix, int len) const {
   if (len > utf8_length()) return false;
   while (len-- > 0) {
     if (prefix[len] != (char) byte_at(len))
       return false;
   }
   assert(len == -1, "we should be at the beginning");
   return true;
 }
 // ------------------------------------------------------------------
 // Symbol::index_of
 //
 // Finds if the given string is a substring of this symbol's utf8 bytes.
 // Return -1 on failure.  Otherwise return the first index where str occurs.
 int Symbol::index_of_at(int i, const char* str, int len) const {
   assert(i >= 0 && i <= utf8_length(), "oob");
   if (len <= 0)  return 0;
   char first_char = str[0];
   address bytes = (address) ((Symbol*)this)->base();
   address limit = bytes + utf8_length() - len;  // inclusive limit
   address scan = bytes + i;
   if (scan > limit)
     return -1;
   for (; scan <= limit; scan++) {
     scan = (address) memchr(scan, first_char, (limit + 1 - scan));
     if (scan == NULL)
       return -1;  // not found
     assert(scan >= bytes+i && scan <= limit, "scan oob");
     if (memcmp(scan, str, len) == 0)
       return (int)(scan - bytes);
   }
   return -1;
 }
 char* Symbol::as_C_string(char* buf, int size) const {
   if (size > 0) {
     int len = MIN2(size - 1, utf8_length());
     for (int i = 0; i < len; i++) {
       buf[i] = byte_at(i);
     }
     buf[len] = '\0';
   }
   return buf;
 }
 char* Symbol::as_C_string() const {
   int len = utf8_length();
   char* str = NEW_RESOURCE_ARRAY(char, len + 1);
   return as_C_string(str, len + 1);
 }
 char* Symbol::as_C_string_flexible_buffer(Thread* t,
                                                  char* buf, int size) const {
   char* str;
   int len = utf8_length();
   int buf_len = len + 1;
   if (size < buf_len) {
     str = NEW_RESOURCE_ARRAY(char, buf_len);
   } else {
     str = buf;
   }
   return as_C_string(str, buf_len);
 }
 void Symbol::print_symbol_on(outputStream* st) const {
   st = st ? st : tty;
   st->print("%s", as_quoted_ascii());
 }
 char* Symbol::as_quoted_ascii() const {
   const char *ptr = (const char *)&_body[0];
   int quoted_length = UTF8::quoted_ascii_length(ptr, utf8_length());
   char* result = NEW_RESOURCE_ARRAY(char, quoted_length + 1);
   UTF8::as_quoted_ascii(ptr, result, quoted_length + 1);
   return result;
 }
 jchar* Symbol::as_unicode(int& length) const {
   Symbol* this_ptr = (Symbol*)this;
   length = UTF8::unicode_length((char*)this_ptr->bytes(), utf8_length());
   jchar* result = NEW_RESOURCE_ARRAY(jchar, length);
   if (length > 0) {
     UTF8::convert_to_unicode((char*)this_ptr->bytes(), result, length);
   }
   return result;
 }
 const char* Symbol::as_klass_external_name(char* buf, int size) const {
   if (size > 0) {
     char* str    = as_C_string(buf, size);
     int   length = (int)strlen(str);
     // Turn all '/'s into '.'s (also for array klasses)
     for (int index = 0; index < length; index++) {
       if (str[index] == '/') {
         str[index] = '.';
       }
     }
     return str;
   } else {
     return buf;
   }
 }
 const char* Symbol::as_klass_external_name() const {
   char* str    = as_C_string();
   int   length = (int)strlen(str);
   // Turn all '/'s into '.'s (also for array klasses)
   for (int index = 0; index < length; index++) {
     if (str[index] == '/') {
       str[index] = '.';
     }
   }
   return str;
 }
 // Alternate hashing for unbalanced symbol tables.
 unsigned int Symbol::new_hash(jint seed) {
   ResourceMark rm;
   // Use alternate hashing algorithm on this symbol.
   return AltHashing::murmur3_32(seed, (const jbyte*)as_C_string(), utf8_length());
 }
 void Symbol::print_on(outputStream* st) const {
   if (this == NULL) {
     st->print_cr("NULL");
   } else {
     st->print("Symbol: '");
     print_symbol_on(st);
     st->print("'");
     st->print(" count %d", refcount());
   }
 }
 // The print_value functions are present in all builds, to support the
 // disassembler and error reporting.
 void Symbol::print_value_on(outputStream* st) const {
   if (this == NULL) {
     st->print("NULL");
   } else {
     st->print("'");
     for (int i = 0; i < utf8_length(); i++) {
       st->print("%c", byte_at(i));
     }
     st->print("'");
   }
 }
 // SymbolTable prints this in its statistics
 NOT_PRODUCT(int Symbol::_total_count = 0;)

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/symbol.cpp@bd7a7ce2e264 (annotated)

src/share/vm/oops/symbol.cpp